Question

7 a cook had a jar containing a sweet food and a jar containing a sour food. the image above shows the sweet and sour foods. at room temperature, both foods are liquids. the same amount of energy was transferred into both substances. later, one of the foods had changed phase while the other had not. which food changed phase, and how did it change?the sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. its molecules now move away from each other.the sweet food changed because the strong attraction between molecules made their movement slower. its molecules now move around each other.the sour food changed because the weak attraction between molecules let them move faster. its molecules now move away from each other.the sour food changed because the molecules were able to move fast enough to overcome the attraction between them. its molecules now move in place.

Explanation:

Phase change from liquid to gas happens when molecules gain enough energy to overcome intermolecular attractions. The sweet food has weak molecular attractions, so with the same energy input, its molecules can move fast enough to break free and move away from each other, changing phase. The sour food has strong attractions, so the same energy isn't enough to overcome them, so it stays liquid.

Answer:

A. The sweet food changed because the molecules were able to move fast enough to overcome the attraction between them. Its molecules now move away from each other.